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Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
 [1],[2]
Oct. 04, 2015
 [3]
Jul. 05, 2015
 [4]
Apr. 05, 2015
Dec. 31, 2014
 [5],[6],[7]
Sep. 28, 2014
 [5],[8]
Jun. 29, 2014
 [5]
Mar. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Income Loss Per Common Share                      
Net income for basic and diluted net income per share $ (641) $ 71,453 $ 102,879 $ 32,787 $ (103,811) $ 82,949 $ 101,205 $ 929 $ 206,477 $ 81,272 $ 164,947
Weighted average common shares-basic                 211,544 202,908 190,772
Incremental shares from assumed conversion of convertible notes [9]                   5,013 23,341
Convertible note hedge warrant shares [10]                   12,562 18,795
Employee stock purchase rights                 41 31 36
Dilutive potential common shares                 1,777 19,642 44,827
Weighted average common shares-diluted                 213,321 222,550 235,599
Net income per common share-basic $ 0.00 $ 0.34 $ 0.48 $ 0.15 $ (0.48) $ 0.40 $ 0.52 $ 0.00 $ 0.98 $ 0.40 $ 0.86
Net income per common share-diluted $ 0.00 $ 0.34 $ 0.48 $ 0.15 $ (0.48) $ 0.38 $ 0.47 $ 0.00 $ 0.97 $ 0.37 $ 0.70
Restricted Stock Units                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 1,130 1,092 1,127
Stock Options                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 606 944 1,528
[1] In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[2] Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[3] Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[4] Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[6] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[7] In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[8] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[9] Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.48, multiplied by 34.7 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
[10] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.67, multiplied by 34.7 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period. Teradyne's call option on its common stock (convertible note hedge transaction) was excluded from the calculation of diluted shares because the effect was anti-dilutive. See Note G: "Debt" regarding the convertible note hedge transaction.